Modelling of Railway Noise Sources with Applications on Swedish Trains.

摘要

In order to be able to apply point source sound propagation theory to the propagation of railway noise it is necessary to describe the train/track system as a number of point sources. In this report different source models will be tested on Swedish trains. The basic idea behind most tests has been to study the sound propagation pattern of real trains. By combining advanced sound propagation theory with different source models and by comparing calculations with measurements in several receiver positions it is possible to evaluate assumptions with respect to number and positions of the point sources selected to describe the noise emission of the train. Special features which have been studied using measurements and simulations are the acoustic properties of the track bed, rail damping, the directivity, the time history during pass-by and the height distribution of sources.